C++ MemHandleUnlock函数代码示例

/***********************************************************************
 *
 * FUNCTION:    MainFormInit
 *
 * DESCRIPTION: This routine initializes the MainForm form.
 *
 * PARAMETERS:  frm - pointer to the MainForm form.
 *
 * RETURNED:    nothing
 *
 * REVISION HISTORY:
 *
 *
 ***********************************************************************/
static void MainFormInit(FormPtr frmP)
{
	FieldPtr			fld;
	char *ptr;
   	MemHandle			mh = MemHandleNew (10);
	fld = GetObjectPtr (MainSymbolField);
	ptr = MemHandleLock (mh);
	strcpy(ptr,"IBM");
	FldSetTextHandle (fld, mh);
    MemHandleUnlock(mh);
}

static UInt16 ConvertBookmarksForRecord
         (
         UInt16        recordId,
         UInt8*        bookmarkPtr,
         OldBookmarkData* dataPtr,
         UInt16        entries,
         Boolean*      done
         )
{
     UInt16    i;
     Header*   record = NULL;
     MemHandle handle = NULL;
     Boolean   success = true;

     for ( i = 0 ; i < entries ; i++ ) {
          if ( dataPtr->recordId == recordId ) {
              AnnotationEntry e;

              if ( handle == NULL ) {
                  handle = ReturnRecordHandle( recordId );

                  if ( handle == NULL )
                      return false;

                  record = MemHandleLock( handle );
              }
              MemSet( &e, sizeof( AnnotationEntry ), 0 );

              e.flags = ANNOTATION_BOOKMARK | ANNOTATION_HIDDEN;

              e.triggerStart = dataPtr->characterPosition;
              e.triggerStop  = dataPtr->characterPosition;

              e.id.uid              = dataPtr->recordId;

              e.id.paragraphNum     = GetParagraphNumber( record, e.triggerStart );
              e.id.indexInParagraph = NEW_ANNOTATION;

              success = AddAnnotation( &e, bookmarkPtr ) && success;

              done[ i ] = true;
          }

          bookmarkPtr    += StrLen( bookmarkPtr ) + 1;
          dataPtr++;
     }

     if ( handle != NULL ) {
         MemHandleUnlock( handle );
         FreeRecordHandle( &handle );
     }

     return success;
}

// Open preferences database and find a record that contains preferences.
// Return errNone if opened succesfully, otherwise an error:
//   psErrNoPrefDatabase - pref database couldn't be found
// devnote: it scans through all records even though we only store preferences
// in one record because I want to be able to use preferences database used
// in earlier versions of Noah Pro/Thes.
Err PrefsStoreReader::ErrOpenPrefsDatabase()
{
    if (_db)
    {
        Assert(_recHandle);
        Assert(_recData);
        return errNone;
    }

    // we already tried to open the database but couldn't, so don't try again
    if (_fDbNotFound)
        return psErrNoPrefDatabase;

    LocalID dbId;
    Err err = ErrFindDatabaseByNameTypeCreator(_dbName, _dbType, _dbCreator, &dbId);
    if (dmErrCantFind==err)
    {
        err = psErrNoPrefDatabase;
        goto ExitAndMarkNotFound;
    }
    if (err)
        goto ExitAndMarkNotFound;
    Assert(0!=dbId);

    _db = DmOpenDatabase(0, dbId, dmModeReadWrite);
    if (!_db)
    {
        err = DmGetLastErr();
        Assert(err);
        goto ExitAndMarkNotFound;
    }

    UInt16 recsCount = DmNumRecords(_db);
    for (UInt16 recNo = 0; recNo < recsCount; recNo++)
    {
        _recHandle = DmQueryRecord(_db, recNo);
        _recData = (unsigned char*)MemHandleLock(_recHandle);
        if ( (MemHandleSize(_recHandle)>=4) && FValidPrefsStoreRecord(_recData) )
        {
            // we found the record with prefernces so remember _recData and _recHandle
            // those must be freed in destructor
            return errNone;
        }
        MemHandleUnlock(_recHandle);
        _recHandle = NULL;
    }

    DmCloseDatabase(_db);
    _db = 0;
    err = psErrNoPrefDatabase;
ExitAndMarkNotFound:
    _fDbNotFound = true;
    return err;
}

/*****************************************************************************
* Function: DrawCourses
*
* Description: local function to fill the course list
*****************************************************************************/
static void
DrawCourses(ListType *lst)
{
  MemHandle mWebsite, mEmail, old;
  Char *buffer;
  FieldType *fldWebsite, *fldEmail;
  
  gNumCourses=CountCourses();
  gCourseList = (Char **) MemPtrNew(gNumCourses * sizeof(Char *));
  gCourseInd = (UInt16 *) MemPtrNew(gNumCourses * sizeof(UInt16));

  CourseListGen(gCourseList, NULL, gCourseInd, gNumCourses, 0, CLIST_SEARCH_INDEX);
  LstSetListChoices(lst, gCourseList, gNumCourses);
  LstSetSelection(lst, -1);

  
  fldWebsite = GetObjectPtr(FIELD_cl_website);
  fldEmail = GetObjectPtr(FIELD_cl_email);
  
  mWebsite = MemHandleNew(4);
  buffer = MemHandleLock(mWebsite);
  MemSet(buffer, 4, 0);
  StrCopy(buffer, "-?-");
  MemHandleUnlock(mWebsite);

  old = FldGetTextHandle(fldWebsite);
  FldSetTextHandle(fldWebsite, mWebsite);
  if (old != NULL)  MemHandleFree(old); 

  mEmail = MemHandleNew(4);
  buffer = MemHandleLock(mEmail);
  MemSet(buffer, 4, 0);
  StrCopy(buffer, "-?-");
  MemHandleUnlock(mEmail);

  old = FldGetTextHandle(fldEmail);
  FldSetTextHandle(fldEmail, mEmail);
  if (old != NULL)  MemHandleFree(old); 

  
}

/* Return info for last openned document */
DocumentInfo* GetLastDocInfo( void )
{
    DocumentInfo* docInfo;

    docInfo = NULL;

    if ( plkrDocList == NULL ) {
        plkrDocList = DmOpenDatabaseByTypeCreator( PlkrDocListType, ViewerAppID,
                        dmModeReadWrite );
    }
    if ( plkrDocList != NULL ) {
        DocumentData*   recordPtr;
        MemHandle       handle;

        ErrTry {
            /* assign doc info values for document */
            handle = FindDocData( Prefs()->docName, ALL_ELEMENTS, NULL );
            if ( handle != NULL ) {
                recordPtr = MemHandleLock( handle );

                StrNCopy( lastDocInfo.name, recordPtr->name, dmDBNameLength );
                lastDocInfo.cardNo      = recordPtr->cardNo;
                lastDocInfo.created     = recordPtr->created;
                lastDocInfo.attributes  = recordPtr->attributes;
                lastDocInfo.size        = recordPtr->size;
                lastDocInfo.categories  = recordPtr->categories;
                lastDocInfo.location    = recordPtr->location;
                lastDocInfo.timestamp   = recordPtr->timestamp;
                if ( lastDocInfo.location != RAM ) {
                    UInt16 fileLength;

                    ReleaseLastDocInfo();

                    fileLength              = StrLen( recordPtr->data ) + 1;
                    lastDocInfo.filename    = SafeMemPtrNew( fileLength );
                    StrNCopy( lastDocInfo.filename, recordPtr->data,
                        fileLength );
                    lastDocInfo.volumeRef   = FindVolRefNum( recordPtr->data +
                                                             fileLength );
                }
                MemHandleUnlock( handle );
                CloseRecord( handle, false );

                CloseDocList();

                docInfo = &lastDocInfo;
            }
        }
        ErrCatch( UNUSED_PARAM( err ) ) {
        } ErrEndCatch

        CloseDocList();
    }

void SetFieldFromInt ( UInt16 fieldID, int data ) {
	
	/* Temporary place in heap in order to store the string data */
	MemHandle txtH;
	
	txtH = MemHandleNew ( 10 );
	if ( !txtH) return;

	StrPrintF ( MemHandleLock(txtH), "%i", data);
	SetFieldFromHandle ( fieldID, txtH);
	MemHandleUnlock (txtH);

}

 /*Returns the File record associated to an vfs fileRef */
Int32 GetFileProperties (FileRef fileRef, file_rec_t* axxFileRec)
{
    Int16 i;
    file_rec_t* axxFileList;

    i = GetFilePos((Int16)fileRef) ;
    if (i == -1)
        return expErrNotOpen;    
    axxFileList = MemHandleLock(axxFileListHandle);
    MemMove (axxFileRec, &axxFileList[i],sizeof(file_rec_t));    
    MemHandleUnlock(axxFileListHandle);
    return errNone;
}

/********************************************************************
 * Function: addRecord
 * Description:  function responsible for writing a packed System record
 * to the database. 
 * ******************************************************************/ 
void writeRecord (MemPtr record, MemHandle recordDBrec) {
	UInt16 length = 0, offset = 0;
	Char *ch;
	
	/* get length of the system buffer */
	length = MemPtrSize (record);
	
	/* re-size and write. */
	if (MemHandleResize (recordDBrec, length) == 0) {
		ch = MemHandleLock (recordDBrec);
		DmWrite (ch, offset, record, length);
		MemHandleUnlock (recordDBrec);
	}
}

/* SetFieldTextFromStr -- Fills a field with a string
 * Args:    
 *     Word     fieldID  -- ID of field to fill, see cwimp.rpc file
 *     CharPtr  strP     -- String to fill ID with
 * Returns:
 *     FieldPtr          -- Ptr to the field set.
 */
FieldPtr SetFieldTextFromStr(Word fieldID, CharPtr strP)
{
  VoidHand txtH;
  
  txtH = MemHandleNew(StrLen(strP) + 1);
  if(!txtH) return NULL;
  
  StrCopy(MemHandleLock(txtH), strP);
  
  // ToDo: SetFieldTextFromHandle should happen *before* unlock
  MemHandleUnlock(txtH);
  
  return SetFieldTextFromHandle(fieldID, txtH);
}

void Graphics::drawBitmap(uint_t bitmapId, const Point& topLeft)
{
    MemHandle handle=DmGet1Resource(bitmapRsc, bitmapId);
    if (handle) 
    {
        BitmapType* bmp=static_cast<BitmapType*>(MemHandleLock(handle));
        if (bmp) 
        {
            WinDrawBitmap(bmp, topLeft.x, topLeft.y);
            MemHandleUnlock(handle);
        }
        DmReleaseResource(handle);
    }
}

void String_Done()
{
	MemHandle *i;
	context* p = Context();

	StringFree();

	for (i=ARRAYBEGIN(p->StrModule,MemHandle);i!=ARRAYEND(p->StrModule,MemHandle);++i)
	{
		MemHandleUnlock(*i);
		DmReleaseResource(*i);
	}
	ArrayClear(&p->StrModule);
}

int AppendField( FieldPtr fld, CharPtr str, UInt len )
{
	Err err=0;
	CharPtr  s;
	VoidHand h;
	UInt prevlen;

	h=(VoidHand)FldGetTextHandle(fld);

	if(h==NULL) {
		h=MemHandleNew(len+1);
		if(h==NULL) return(-1);
		s=MemHandleLock(h);
		StrNCopy(s, str, len);
		s[len]=0;
		MemHandleUnlock(h);
	} else {
		prevlen=FldGetTextLength(fld);

		FldSetTextHandle(fld, NULL);

		if( MemHandleSize(h)<=(prevlen+len)) {
			err=MemHandleResize( h, prevlen+len+1 );
		}
		if( err!=0 ) return(-1);

		s=MemHandleLock(h);
		StrNCopy(s+prevlen, str, len);
		s[len+prevlen]=0;
		MemHandleUnlock(h);
	}

	FldSetTextHandle(fld, (Handle)h);
	/* FldDrawField(fld); */

	return( 0 );
}

/*****************************************************************************
* Function: GadgetDrawWeekdays
*
* Description: Draws the weekdays, extra function since called in
*              GadgetDrawTimeline
*****************************************************************************/
void
GadgetDrawWeekdays(void)
{
  UInt8 i;
  MemHandle mh;
  Char *text;
  RGBColorType color, prevColor;
  DateTimeType now;
  Int16 dow;
  RectangleType bounds, rect;
  UInt16 gadgetIndex;

  // Get info about Gadget
  gadgetIndex = FrmGetObjectIndex(gForm, gGadgetID);
  FrmGetObjectBounds(gForm, gadgetIndex, &bounds);

  // Initialize time constants
  TimSecondsToDateTime(TimGetSeconds(), &now);
  dow = DayOfWeek(now.month, now.day, now.year);
  
  RctSetRectangle(&rect, bounds.topLeft.x+GADGET_BASELEFT+GADGET_LEFT, bounds.topLeft.y,
                         130, FntLineHeight()+2);

  // Erase background
  WinEraseRectangle(&rect, 0);

  for (i=0; i < gGadgetDaysNum; ++i) {
    Int16 leftoff;
    mh = DmGetResource(strRsc, GADGET_STRINGS_WDAYSTART+i);
    text = MemHandleLock(mh);
    leftoff = (gGadgetDaysWidth+2 - FntLineWidth(text, MemPtrSize(text))) / 2;
    if (TNisColored() && (dow == i+1)) {
      color.r = 0xFF;  color.g = 0x00;  color.b = 0x00;
      TNSetTextColorRGB(&color, &prevColor);
    }
    WinDrawChars(text, StrLen(text), bounds.topLeft.x+GADGET_BASELEFT+GADGET_LEFT+i*gGadgetDaysWidth+i+leftoff+2, bounds.topLeft.y);
    if (dow == i+1) {
      if (TNisColored()) {
        TNSetTextColorRGB(&prevColor, NULL);
      } else {
        // Draw some kind of underline to determine current day
        Int16 lineWidth=FntLineWidth(text, StrLen(text));
        WinDrawLine(rect.topLeft.x+i*gGadgetDaysWidth+i+leftoff+1, rect.topLeft.y+FntLineHeight(),
                    rect.topLeft.x+i*gGadgetDaysWidth+i+leftoff+1+lineWidth, rect.topLeft.y+FntLineHeight());
      }
    }
    MemHandleUnlock(mh);
  }
}

Boolean
CourseGetIndex(DmOpenRef cats, UInt16 category, UInt16 courseID, UInt16 *index)
{
  MemHandle m;

  *index = 0;
  
  while ((m = DmQueryNextInCategory(cats, index, category)) != NULL) {
    Char *s=(Char *)MemHandleLock(m);
    if (s[0] == TYPE_COURSE) {
      CourseDBRecord c;
      UnpackCourse(&c, s);
      if (c.id == courseID) {
        // Found it!
        MemHandleUnlock(m);
        return true;
      }
    }
    MemHandleUnlock(m);
    *index += 1;
  }

  return false;
}

/**************************************************************************
 * Function: getSystemFromIndex
 * Description: based upon a system database index, this will locate the
 * system for that index, unpack and decrypt it and initialize s
 * ************************************************************************/ 
void getSystemFromIndex (DmOpenRef SystemDB, md_hash * SysPass, UInt16 index, MemHandle tmp, System * s) {
	MemHandle rec = DmQueryRecord (SystemDB, index);
	if (rec) {
		MemPtr scratch, buff = MemHandleLock (rec);
		
			/*	resize the buffer */
		if (MemHandleResize (tmp, MemPtrSize (buff)) == 0) {
			scratch = MemHandleLock (tmp);
			
			/*	unpack and decrypt the account */
			UnpackSystem (s, buff, scratch, SysPass, MemHandleSize (rec), true); 
		}
		MemHandleUnlock (rec);
	}
}